Problems With Cucumbers - Knowledgebase Question

Hi, I planted cucumbers and they were doing fine then all of a sudden the stems became almost transparent and the plants died. The best way for me to describe the stem is that they look like something sucked the juice out of the stem and they collapsed. The thing is I don't see any bugs or fungus and not all the plants were affected. We have had about 7 days of rainy, cloudy humid weather and very little sun, could this have anything to do with it? I'm at my wits end. Thanks Dorothy